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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Lessee, Operating Lease, Liability, Maturity [Table Text Block] As of June 30, 2021, the maturities of operating lease liabilities are as follows (in thousands):
Operating Leases
Remaining 2021$9,391 
202217,397 
202316,022 
202412,529 
20258,733 
2026 and beyond3,352 
Total undiscounted cash payments67,424 
Less: amount representing interest(3,343)
Present value of future minimum lease payments64,081 
Less: current obligations under leases16,889 
Long-term lease obligation$47,192 
Schedules of Concentration of Risk, by Risk Factor
As of June 30, 2021, the flight crewmember employees of ABX, ATI and Omni and flight attendant employees of ATI and Omni were represented by the labor unions listed below:
AirlineLabor Agreement UnitPercentage of
the Company’s
Employees
ABXInternational Brotherhood of Teamsters4.6%
ATIAir Line Pilots Association9.0%
OAIInternational Brotherhood of Teamsters6.2%
ATIAssociation of Flight Attendants0.6%
OAIAssociation of Flight Attendants5.9%